base

-> Added edge behaviour for StackView (what to do at
   the beginning and end of the stack)
-> Wrapping children of AdapterViewAnimator in a
   FrameLayout to uphold the Adapter contract (ie.
   don't modify the Adapter's views.)
-> Fixed clipping problem in StackViews with padding

Change-Id: I83b02b5fdfd687838346e0bcb5dc30c033cd0cb8